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    SubjectRe: poll() incompatability with POSIX.1-2001
    Date
    On Tuesday 15 October 2002 05:36, you wrote:

    > This is the result on a return from poll().
    >
    > glee@orion ~/tmp $ ./poll-new -h xx.xx.xx.xx -p 80
    > connect
    > connect: INPROGRESS
    > poll: POLLOUT is set
    > terminating
    > glee@orion ~/tmp $
    >
    >
    > So, POLLOUT is set.
    >
    >
    > Now, we try to connect to an invalid port.
    >
    > n ~/tmp $ ./poll-new -h xx.xx.xx.xx -p 4
    > connect
    > connect: INPROGRESS
    > poll: POLLERR set
    > poll: POLLHUP set
    > poll: POLLOUT is set
    > terminating
    > glee@orion ~/tmp $
    >
    >
    > So, POLLOUT is set.

    Hello, on what version did you try this? I've tried this now on
    Linux-2.4.18 and Linux-2.4.19 and both give the behaviour i described
    previously (No POLLOUT set).

    The simple test program i used is as follows:
    #include <stdio.h>
    #include <fcntl.h>
    #include <unistd.h>
    #include <netinet/in.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <sys/poll.h>
    #include <sys/select.h>
    #include <errno.h>

    main(int argc, char **argv) {
    int sd,flags,stat,len=sizeof(int);
    struct sockaddr_in sin;
    struct pollfd pfd;

    memset(&sin, 0, sizeof(sin));

    sd = socket(AF_INET, SOCK_STREAM, 0);
    fcntl(sd, F_SETFL, fcntl(sd, F_GETFL, 0) | O_NONBLOCK);

    sin.sin_addr.s_addr = htonl(0x7f000001);
    sin.sin_port = htons(atoi(argv[1]));
    sin.sin_family = AF_INET;

    if(connect(sd, (struct sockaddr *)&sin, sizeof(sin)) == -1 && errno ==
    EINPROGRESS)
    printf("connect returned EINPROGRESS\n");

    pfd.fd = sd;
    pfd.events = POLLIN | POLLOUT;
    pfd.revents = 0;

    poll(&pfd, 1, -1);
    getsockopt(sd, SOL_SOCKET, SO_ERROR, &stat, &len);
    printf("%s\n", stat ? "failed" : "succeeded");
    printf("returned events: %hd\n", pfd.revents);
    }

    bighawk

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